AFDD(Arc Fault Detection Device)

Electrical Features

Mode Electronic
Type A
Rated current In 6,10,16,20,25,32,40A
Poles 1P+N
Rated voltage Ue 230V~
Insulation voltage Ui 400V
Rated frequency 50Hz
Rated residual operating current(I△n) 30mA
Break time under I△n ≤0.1s
Rated breaking capacity 6,000A
Energy limiting class 3
Rated impulse withstand voltage(1.5/50)Uimp 4,000V
Dielectric test voltage at ind.Freq.for 1min 2kV
Pollution degree 2
Magnetic tripping curve B C
Over-voltage tripping range AC 275V ±5 %

Mechanical Features

Electrica l endurance 4,000 cycles
Mechanical endurance 10,000 cycles
Contact position indicator Yes
Protection degree IP 40 in Sentry MCU & Enclosures
Reference temperature for setting of thermal element 30℃
Ambient temperature(with daily average 35 ≤ ℃) -5℃~+40℃
Storage temperature -25℃~+55 ℃


Terminal connection type Cable/Pin-type busbar
Tightening torque for L-LINE 2.5Nm
Tightening torque for L&N-LOAD 1.2Nm
Mounting On DIN rail EN60715(35mm) by means of fast clip device
Connection  Terminal

Part Numbers

Part No Descriptions
AFDD-06B  6A B Curve AFDD
AFDD-10B  10A B Curve AFDD
AFDD-16B  16A B Curve AFDD
AFDD-20B  20A B Curve AFDD
AFDD-25B  25A B Curve AFDD
AFDD-32B  32A B Curve AFDD
AFDD-40B  40A B Curve AFDD

Fault identification

Upon proper terminal connections, with power supply on, the LED shall be off before the AFDD is switched on.

Switch the AFDD to ON position, LED shall illuminate green colour and the device operates normally. Please consult electrical engineer in case LED does not illuminate or illuminates red colour.

Once AFDD trips during its regular service, in order to analyse and identify circuit faults, please disconnect its downstream load first and then switch the device to ON position. Here below are the cross references of LED illumination and faults:

  1. red LED flash x 5, serial or parallel arc fault.
  2. yellow LED flash x3, 5 cycles, earlth leakge.
  3. yellow LED flash x2, 5 cycles, over-voltage.
  4. green LED on, overcurrent or short circuit

Circuit Diagram